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    • ULINE
      https://www.uline.com › Corrugated › Boxes

      9x9x4" Shipping Boxes | In Stock – Ships Today | Fast Delivery

     
  1. Learn more:
    The maximum size for Priority Mail items is 108 inches in combined length and girth (the length of the longest side, plus the distance around its thickest part). The Priority Mail Flat-Rate Box is priced at $8.95, regardless of weight, contents, or distance traveled.
    about.usps.com/postal-bulletin/2007/html/pb22218…
    Maximum weight is 70 lbs. You’ll need to measure your package to make sure it meets the size standards. Maximum combined length and girth (girth is the distance around the thickest part) is 108 inches. Tips for Measuring Packages Dimensional (DIM) weight rates apply to large, lightweight packages.
    www.usps.com/ship/priority-mail.htm
     
  2. Boxes | Priority Mail | USPS.com

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